Optimum relay position searching method and system based on accumulated positive feedback variable steps

Abstract

The invention is suitable for the technical field of wireless communication and provides a searching method of an optimum communication position of a single moving relay. The method comprises the steps that: the moving relay initializes position information thereof and records initial position information at any initial position on a fixed track, then receives a training sequence from a source end, carries out amplification and forwards the training sequence to a target end; B, according to the received amplified training sequence, the target end calculates communication performance of the received signal and feeds single-bit information back to the moving relay according to the calculation result; C, according to the fed single-bit information, the moving relay calculates the position at the next moment, moves to the position at the next moment and returns to the step A until an optimum relay position is finally determined. By adopting the searching method and system, the relay communication performance is improved, the position information of the source end and the target end are not needed, a plurality of antennas are not needed, the moving relay can find the optimum relay position in a given moving lotus range only by utilizing the single-bit information fed back by the target end.

Description

Technical field [0001] The invention belongs to the field of wireless communication technology, and in particular relates to a method and system for searching an optimal relay position based on cumulative positive feedback variable step length. Background technique [0002] The communication relay is used to forward information sent between different nodes, which expands the communication range and improves the performance of the communication system. Terrestrial radio communications are easily blocked and shielded by obstacles. Aircraft, satellites and UAVs (Unmanned Aerial Vehicles, UAVs) can act as communication relays, because airborne relays can effectively communicate with each other in rugged mountainous areas or urban areas. The two parties establish a connection. In recent years, the problem of using drones as communication relays has attracted the attention and research of many scholars, and its applications are also very extensive. [0003] The existing algorithms appl...

AI Technical Summary

Problems solved by technology

The existing UAV relay position search algorithms can make the UAV find the best relay position on their own basis, but there are also certain deficiencies and defects in the scope of application of these algorithms, which are mainly reflected in:( 1) Both the source end and the destination end need to have the GPS function to provide their respective location information to the mobile relay, but in many special cases, both parties do not have the GPS function or the GPS device is damaged, such as the GPS device is damaged due to natural disasters, (2 ) Use airborne multi-antennas to estimate the signal angle of arrival (DirectionOfArrival, DOA) to search for the best relay position, which is prone to estimation errors and increases the complexity and algorithm complexity of UAV communication equipment

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